Update to version 8.5.5 | Read HISTORY.md

Former-commit-id: dced7d472edabbab4f80c76051f13261928a8dea

core/maintenance/version/fetch.go

@@ -0,0 +1,59 @@
+package version
+
+import (
+	"io/ioutil"
+	"strings"
+	"time"
+
+	"github.com/hashicorp/go-version"
+
+	"github.com/kataras/golog"
+	"github.com/kataras/iris/core/netutil"
+)
+
+const (
+	versionURL = "https://raw.githubusercontent.com/kataras/iris/master/VERSION"
+)
+
+func fetch() (*version.Version, string) {
+	client := netutil.Client(time.Duration(30 * time.Second))
+
+	r, err := client.Get(versionURL)
+	if err != nil {
+		golog.Debugf("err: %v\n", err)
+		return nil, ""
+	}
+	defer r.Body.Close()
+
+	if r.StatusCode >= 400 {
+		golog.Debugf("Internet connection is missing, updater is unable to fetch the latest Iris version\n", err)
+		return nil, ""
+	}
+
+	b, err := ioutil.ReadAll(r.Body)
+
+	if len(b) == 0 || err != nil {
+		golog.Debugf("err: %v\n", err)
+		return nil, ""
+	}
+
+	var (
+		fetchedVersion = string(b)
+		changelogURL   string
+	)
+	// Example output:
+	// Version(8.5.5)
+	// 8.5.5:https://github.com/kataras/iris/blob/master/HISTORY.md#tu-02-november-2017--v855
+	if idx := strings.IndexByte(fetchedVersion, ':'); idx > 0 {
+		changelogURL = fetchedVersion[idx+1:]
+		fetchedVersion = fetchedVersion[0:idx]
+	}
+
+	latestVersion, err := version.NewVersion(fetchedVersion)
+	if err != nil {
+		golog.Debugf("while fetching and parsing latest version from github: %v\n", err)
+		return nil, ""
+	}
+
+	return latestVersion, changelogURL
+}